I went to a specialised hifi store today and tested the Naim Qb and Sonos 5 next to eachother in a test room set up like a living room. I must say the Sonos does not compare to the Qb when you compare the depth and clarity of the sound. The Naim is much clearer, the bass is way better and at low and high volumes just sounds better to me. I was also told that Naim would likely come out with a software upgrade for stereo soon so that problem (if you can call it that) will likely be resolved. The app was great to use, and to me the look and finish of the Naim also kills the plastic look of the Sonos 5. Only downside imho is the limited multi room possibilities (limited to 4 for now). I currently only need 3 rooms so not an issue for now. I also took a quick look at the Bluesound but the app was nowhere as user friendly... So I think the Naim is a winner, at least for me. Thanks to all for your advice!